Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P31/00—Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
  • G01R31/34—Testing dynamo-electric machines
  • G01R31/343—Testing dynamo-electric machines in operation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J3/00—Time-division multiplex systems
  • H04J3/02—Details
  • H04J3/06—Synchronising arrangements
  • H04J3/0635—Clock or time synchronisation in a network
  • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
  • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
  • H02K11/21—Devices for sensing speed or position, or actuated thereby
  • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/35—Devices for recording or transmitting machine parameters, e.g. memory chips or radio transmitters for diagnosis
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
  • H02P29/02—Providing protection against overload without automatic interruption of supply
  • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
  • H04W4/02—Services making use of location information
  • H04W4/025—Services making use of location information using location based information parameters
  • H04W4/027—Services making use of location information using location based information parameters using movement velocity, acceleration information
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
  • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

Definitions

• the present invention relates to a method of synchronization of sensors, attached to an electrical motor, which obtained data used during phase analysis.
• the present invention also relates to a computer program product and a computer-readable storage medium.
• the invention proposes to use the motor own magnetic field to synchronize devices mounted on different parts of an induction motor. It takes advantage of already used magnetometers avoiding need for cables or additional radio sensor and radio emitter unit. It is therefore simpler, less prone to failure and cheaper setup.
• a first aspect of the present invention is a method of synchronization of sensors.
• Each sensor comprising an internal clock, an accelerometer, a magnetic field sensor and a wireless communication means, for monitoring an electrical motor.
• the method comprising steps of:
• a step e is performed after the step d, namely when analyzing of the acceleration data indicates that there is a malfunction of the electrical motor, an alarm is set.
• the position of the sensor is predefined, preferably the position is provided with a precision of +/-5 degrees.
• the acceleration data are used to calculate the position of the sensors.
• a step f is performed, namely synchronization of the internal clocks of the sensors is performed wirelessly, preferably with a Bluetooth protocol.
• the step f is performed when the desynchronization time is greater than 100ms, preferably it is greater than 8ms.
• a step g is performed during which one of the sensors emits a synchronization signal which cause other sensors to start acquisition of the data related to the acceleration and the magnetic field of the motor.
• a second aspect of the present invention is a computer program product comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method as described hereinbefore.
• a third aspect of the present invention is a computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out the method as described hereinbefore.
• a goal of the invention is to provide a method of a synchronization of the sensors without additional equipment and a use of the radio communication such that the a system performing the method will be cheap to manufacture and during an exploitation.
• fig. 1 The general concept of the invention is shown in fig. 1 , where there are two sensors 2 attached to the motor 1. Those sensors 2 are used to measure acceleration, that is a vibration of the motor, so that a phase analysis may be performed.
• a method of synchronization of sensors 2 is thus proposed.
• the method comprising steps of:
• An exemplary data set is presented in fig. 2 .
• both sensors should measure a magnetic peak value in the same time, which is not true according to data obtained.
• the difference between both data sets may be used to calculate the desynchronization time dT being a difference between a time of the magnetic peak value measured by both sensors 2.
• a step e is performed after the step d, namely when analyzing of the acceleration data indicates that there is a malfunction of the electrical motor 1, an alarm is set.
• the position of the sensor 2 is predefined, preferably the position is provided with a precision of approx. +/-5 degrees. Such accuracy may be obtained by a technician without using any equipment.
• the acceleration data are used to calculate a an exact position of the sensors 2 - a gravity may be used to provide a more precise angle between the sensors 2. It should be mentioned that sensors 2 are usually placed close to the bearings of the motor 1 such that each senor 2 is near a different bearing.
• the acceleration data are used to calculate the position of the sensors 2 with minimal prior information regarding positions of the sensors 2.
• the angle between the sensors 2 is calculated on a basis of the gravity only. It should be however noted that both sensors 2 must be in the same position relative to the motor 1 shaft, that is, for example, that both bottom sides of the sensors 2 points toward the shaft. In such a case it is possible to determine which one of the sensors 2 measure the peak magnetic value first. Such approach is possible when the mounting surface is cylindrical. Alternative approach is to trigger the measurement by magnetic field slope. That would be sensitive though to the offset of magnetization if magnetic DC is not removed.
• a step f is performed, namely synchronization of the internal clocks of the sensors 2 is performed wirelessly, preferably with a Bluetooth protocol. It is done so that the desynchronization time dT is within a limits which assure that obtained data may be used.
• the desynchronization time dT should be lower than 100ms, even more preferably lower than 8ms.
• a clock synchronization via a wireless communication channel needs to be better that half of a period of a rotation of a motor magnetic field. That is possible with a standard wireless communication. It is expected that such a wireless synchronization will be needed once every 2-3 years at most, usually even every few months.
• a step g is performed during which one of the sensors 2 emits a synchronization signal which cause other sensors 2 to start acquisition of the data related to the acceleration and the magnetic field of the motor 1.
• synchronization signal may also be used with better clocks as an additional measure to provide that the data related to the acceleration and the magnetic field of the motor 1 are collected in a time which allows to used said data in further analysis.
• a computer program product comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method is an another aspect of the invention.
• a computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to carry out the method is a yet another aspect of the invention.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

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Family Applications (1)

Country Status (3)

Citations (3)

• 2024
  • 2024-03-07 EP EP24162086.3A patent/EP4614804A1/fr active Pending
• 2025
  • 2025-03-04 US US19/069,691 patent/US20250283943A1/en active Pending
  • 2025-03-05 CN CN202510257681.8A patent/CN120614071A/zh active Pending

Patent Citations (3)

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